The Story of the Birds; Being an Introduction to the Study of Ornithology

The Story of the Birds; Being an Introduction to the Study of Ornithology

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...birds. In a similar manner deserts have checked avine colonisation in certain directions. It must always be borne in mind that normal dispersal or extension of area is a result of numerical increase; as the individuals of any species multiply they seek out new quarters and occupy new districts. But the country that this surplus population invades must be suited to the requirements of the species that is gradually invading it. If a supply of food cannot be obtained, especially during the breeding season, if suitable nesting-places are absent, then the colonising movement cannot proceed in that direction. The special requirements of each species determine the general line of its emigration. Forest birds could not, and would not, attempt to increase their area across treeless plains; aquatic birds would only seek to do so in directions (always, however, conforming to the suggested law of dispersal already described) where suitable haunts presented; whilst birds that dwelt upon steppes.and open country would follow such country only and colonise it. Then, again, mountain species would keep closely to the mountains in entering new areas of dispersal; coast birds could only follow the trend of the shore. Then in countless instances as a sedentary species has gradually spread from a more or less equatorial base, all the early progenitors of that species may have from a variety of causes absolutely disappeared, and left their descendants as colonists in new countries far remote from their primal origin, without a trace being left to indicate the line of their dispersal. In some cases we can form a pretty accurate idea of the general route by the various allied and representative species which have established themselves nearer to the point of more

Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236666089
  • 9781236666086